/*
 * Copyright (c) 2023 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**---
 description: >
   Non-null and non-undefined type guards
 module: ESNext
 isCurrent: true
 ---*/


import { Assert } from "../../../suite/assert.js"

function testNullAndUndefined(x: number): string {
    return x.toString();
}

let x: number | null | undefined;
x = 1;

Assert.equal(testNullAndUndefined(x), '1');

let y: number | null | undefined;

let ad =  y && testNullAndUndefined(y) ;
ad = "1"
Assert.equal(ad, "1");
ad = undefined
Assert.equal(ad, undefined);
ad = null;
Assert.equal(ad, null);